Use Send Via Server

To "Settings/Registration Table."
You can use the Send Via Server setting as a condition to send to I-fax addresses.
1.
Press (Settings/Registration).
2.
Press [Function Settings] → [Send] → [E-Mail/I-Fax Settings].
3.
Press [Use Send via Server].
4.
Press [On] → [OK].
Select [Off] to not use the Send Via Server setting as a condition to send to I-fax addresses.
NOTE
For I-fax, if <Send Via Server> is set to 'Off', there is no size limit on the data that is sent, even if you enter the maximum data size for sending.